After searching for a bit and testing,seems these files are related to snapchat? I've uninstalled the app,deleted the files and will check later to see if they reappear.
Malwarebytes hasn't picked up anything,but I'm curious. Every few hours,2 very small files (atm,one is 500b and the other 2.7kb) appear at the same time in the storage/download folder of my phone. They have random names and they seem to have RW properties. Is there any known app that causes this? Or any infection? I'd appreciate an explanation as i'm quite skeptical.